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(11) | EP 0 829 358 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | An ink jet recording head, an ink jet cartridge, and an ink jet recording apparatus |
| (57) An ink jet recording head comprises a grooved ceiling plate provided with a plurality
of discharge openings for discharging ink, and a plurality of ink flow path grooves
to form ink flow paths conductively connected with the discharge openings, a plurality
of elemental substrates provided with a plurality of electrothermal transducing devices
to generate thermal energy used for discharging ink, and a metallic pressure member
for pressing the plurality of elemental substrates to be in contact with the grooved
ceiling plate. The grooved ceiling plate and the elemental substrates are coupled
to enable the ink flow path grooves and the electrothermal transducing devices to
correspond to each other for the formation of ink flow paths. Here, the pressure member
presses the reverse side of the surface of the elemental substrates having the electrothermal
transducing devices provided therefor in order to couple the elemental substrates
with the grooved ceiling plate. With the structure thus arranged, heat generated by
the elemental substrates is efficiently transferred to the pressure member for radiation
even for an ink jet recording head having no base plate or having a smaller base plate
than the conventional one, while coupling the substrates and ceiling plate closely
and reliably for the attainment of high quality recording. |